Milestones do not complete

OK, I have completed testing for your milestone functionality and it simply does not work - a milestone which has all of its associated tasks shown as 100% complete should be show as Complete, it does not, it remains in the Overdue Milestones category and does not show in the appropriate reports either - nor is there anyway of forcing a milestone to be closed either.

or to describe it another way
Milestone -> tasklist -> tasks ... if all tasks in the task list are complete, then the Milestone is complete. I have instances of task lists associated with milestones with all tasks completed, and task lists associated with milestones with 1 of 1 task completed - in all instances the Milestone should be completed and it is not

This makes the entire basis for using Zoho as a project planning tool more or less a complete waste of time - if the basic milestone tracking does not work, I cannot use the product.

Please advise urgently as to the status of this, whether it is a known bug, if so, when it will be fixed
markgenn